MIT Libraries logoDSpace@MIT

MIT
View Item 
  • DSpace@MIT Home
  • MIT Libraries
  • MIT Theses
  • Doctoral Theses
  • View Item
  • DSpace@MIT Home
  • MIT Libraries
  • MIT Theses
  • Doctoral Theses
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Materials with supramolecular chirality : liqid crystals and polymers for catalysis

Author(s)
Martin, Karen Villazor
Thumbnail
DownloadFull printable version (6.385Mb)
Other Contributors
Massachusetts Institute of Technology. Dept. of Chemistry.
Advisor
Timothy M. Swager.
Terms of use
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582
Metadata
Show full item record
Abstract
Mesomorphic organizations provide a powerful and efficient method for the preorganization of molecules to create synthetic materials with controlled supramolecular architectures. Incorporation of polymerizable groups within a liquid crystalline template can set the stage for the synthesis of anisotropic molecular networks. This dissertation details the synthesis and characterization of chiral liquid crystals and crosslinked polymer networks, with an eye toward applications in asymmetric catalysis. Chapter One gives an introduction to the study of liquid crystals and their phases. Chapters Two and Three describe the incorporation of terminal olefins as polymerizable groups within a columnar liquid crystalline template as an effective method for the synthesis of robust, anisotropic polymeric materials. Upon in situ acyclic diene metathesis (ADMET) polymerization, the original mesophase order is retained. Chapter Two involves the room temperature polymerization of iron(III) tris(diketonate) liquid crystals, resulting in densely crosslinked materials. The focus of Chapter Three is the polymerization of dioxomolydenum-based liquid crystals, performed at high temperature, and their potential to serve as catalysts for asymmetric epoxidation. In Chapter Four, a different approach towards the synthesis of catalytically active anisotropic materials is taken, incorporating well-established, transition metal catalysts within a liquid crystalline framework. Progress towards the formation of liquid crystal phases containing C₂- symmetric bis(oxazoline) and pincer ligands is detailed. Finally, Chapter Five describes the immobilization of chiral monodentate oxazoline ligands for use as catalysts in asymmetric cyclopropanation. Preliminary results indicate that the heterogeneous system gives higher enantioselectivities than the analogous homogeneous system.
Description
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, February 2005.
 
Vita.
 
Includes bibliographical references.
 
Date issued
2005
URI
http://hdl.handle.net/1721.1/30201
Department
Massachusetts Institute of Technology. Department of Chemistry
Publisher
Massachusetts Institute of Technology
Keywords
Chemistry.

Collections
  • Doctoral Theses

Browse

All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

My Account

Login

Statistics

OA StatisticsStatistics by CountryStatistics by Department
MIT Libraries
PrivacyPermissionsAccessibilityContact us
MIT
Content created by the MIT Libraries, CC BY-NC unless otherwise noted. Notify us about copyright concerns.